Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 3416630d9f1b3956…

MALICIOUS

Office (OOXML) / .XLSX

2.83 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2026-02-27
MD5: f9b3471716c91e9fbdf4e0beea66dfe7 SHA-1: 06049dc4dc67038ce3856b68fb4ada5f452294c5 SHA-256: 3416630d9f1b395646e93fac23f25e727713404f49ef302697bbd1d70fb2838c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's used to exploit a vulnerability for client execution. The specific exploit is likely related to Equation Editor, a common vector for malware delivery.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8e0xyQ08.a3j contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c4bd3129cc2afc32f5c593f16df2813ac197614f00d4fd5334f3c8307242409c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8e0xyQ08.a3j 2877440 bytes
ooxml_oleobject_00_ole10native_00.bin
2db02cd17b2a4b6b7e1b04e2ae05434cdbf787728388dba0e2d9cde0d0dffcac		 ole-package OOXML xl/embeddings/8e0xyQ08.a3j Ole10Native stream: OlE10NATIVE 2852811 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.